/**
 * @fileoverview   anim/easing  Anim缓动模块
 * Created by fu.
 * Date: 12-2-15
 * Time: 下午3:42
 */
F.reg('anim/easing', function (f, anim) {

    anim.tween=f.merge(anim.tween, {
        //二次方缓动
        easeInQuad:function (t, b, c, d) {
            return c * (t /= d) * t + b;
        },
        easeOutQuad:function (t, b, c, d) {
            return -c * (t /= d) * (t - 2) + b;
        },
        easeInOutQuad:function (t, b, c, d) {
            if ((t /= d / 2) < 1) return c / 2 * t * t + b;
            return -c / 2 * ((--t) * (t - 2) - 1) + b;
        },
        //三次方缓动
         easeInCubic:function (t, b, c, d) {
            return c * (t /= d) * t * t + b;
        },
        easeOutCubic:function (t, b, c, d) {
            return c * ((t = t / d - 1) * t * t + 1) + b;
        },
        easeInOutCubic:function (t, b, c, d) {
            if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
            return c / 2 * ((t -= 2) * t * t + 2) + b;
        },
        //四次方缓动
        easeInQuart:function (t, b, c, d) {
            return c * (t /= d) * t * t * t + b;
        },
        easeOutQuart:function (t, b, c, d) {
            return -c * ((t = t / d - 1) * t * t * t - 1) + b;
        },
        easeInOutQuart:function (t, b, c, d) {
            if ((t /= d / 2) < 1) return c / 2 * t * t * t * t + b;
            return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
        },
        //五次方缓动
        easeInQuint:function (t, b, c, d) {
            return c * (t /= d) * t * t * t * t + b;
        },
        easeOutQuint:function (t, b, c, d) {
            return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
        },
        easeInOutQuint:function (t, b, c, d) {
            if ((t /= d / 2) < 1) return c / 2 * t * t * t * t * t + b;
            return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
        },
        //正弦曲线缓动
        easeInSine:function (t, b, c, d) {
            return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
        },
        easeOutSine:function (t, b, c, d) {
            return c * Math.sin(t / d * (Math.PI / 2)) + b;
        },
        easeInOutSine:function (t, b, c, d) {
            return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
        },
        //指数曲线缓动
        easeInExpo:function (t, b, c, d) {
            return (t == 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
        },
        easeOutExpo:function (t, b, c, d) {
            return (t == d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
        },
        easeInOutExpo:function (t, b, c, d) {
            if (t == 0) return b;
            if (t == d) return b + c;
            if ((t /= d / 2) < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
            return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;

        },
        //圆形曲线的缓动
        easeInCirc:function (t, b, c, d) {
            return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
        },
        easeOutCirc:function (t, b, c, d) {
            return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
        },
        easeInOutCirc:function (t, b, c, d) {
            if ((t /= d / 2) < 1) return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
            return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
        },
        //指数衰减的正弦曲线缓动
        easeInElastic:function (t, b, c, d, a, p) {
            if (t == 0) return b;
            if ((t /= d) == 1) return b + c;
            if (!p) p = d * .3;
            if (!a || a < Math.abs(c)) {
                a = c;
                var s = p / 4;
            }
            else var s = p / (2 * Math.PI) * Math.asin(c / a);
            return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
        },
        easeOutElastic:function (t, b, c, d, a, p) {
            if (t == 0) return b;
            if ((t /= d) == 1) return b + c;
            if (!p) p = d * .3;
            if (!a || a < Math.abs(c)) {
                a = c;
                var s = p / 4;
            }
            else var s = p / (2 * Math.PI) * Math.asin(c / a);
            return (a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b);
        },
        easeInOutElastic:function (t, b, c, d, a, p) {
            if (t == 0) return b;
            if ((t /= d / 2) == 2) return b + c;
            if (!p) p = d * (.3 * 1.5);
            if (!a || a < Math.abs(c)) {
                a = c;
                var s = p / 4;
            }
            else var s = p / (2 * Math.PI) * Math.asin(c / a);
            if (t < 1) return -.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
            return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p) * .5 + c + b;
        },
        //超过范围的三次方缓动
        easeInBack:function (t, b, c, d, s) {
            if (s == undefined) s = 1.70158;
            return c * (t /= d) * t * ((s + 1) * t - s) + b;
        },
        easeOutBack:function (t, b, c, d, s) {
            if (s == undefined) s = 1.70158;
            return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
        },
        easeInOutBack:function (t, b, c, d, s) {
            if (s == undefined) s = 1.70158;
            if ((t /= d / 2) < 1) return c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b;
            return c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;
        },
        //指数衰减的反弹缓动
        easeInBounce:function (t, b, c, d) {
            return c - anim.tween.easeOutBounce(d - t, 0, c, d) + b;
        },
        easeOutBounce:function (t, b, c, d) {
            if ((t /= d) < (1 / 2.75)) {
                return c * (7.5625 * t * t) + b;
            } else if (t < (2 / 2.75)) {
                return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
            } else if (t < (2.5 / 2.75)) {
                return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
            } else {
                return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
            }
        },
        easeInOutBounce:function (t, b, c, d) {
            if (t < d / 2) return anim.tween.easeInBounce(t * 2, 0, c, d) * .5 + b;
            else return anim.tween.easeInOutBounce(t * 2 - d, 0, c, d) * .5 + c * .5 + b;
        }
    });
    return anim;
}, {
    requires:[

    ]
});